So you are out and about with your laptop, but you look around and there’s no power outlet. Common problem. But if somebody there had had this gadget, they could just stick it into the end of their laptop power supply, and share with you.
Well, assuming they are the nice sort, anyway. The extension costs ¥1,400 ($15) for a two-prong version or ¥2,000 ($21) for three prongs. It’s a great idea, just as long as you have an outlet to begin with.